Mold and centering device for sewers, conduits, &amp;c.



PATENTED APR. 23, 1907.

J. B. BLAW. MOLD AND GENTERING DEVICE FOR SBWBRS, GONDUITS, 8m.

APPLICATION IILBD JAN 2 BHBETB-BHEET 1.

O Q 2 4 u I b m w 0 /r 1 l a a 7 a WWW? x) 3. 1/ a H ,w. J V

13 i lincooca PATENTED APR. 23, 1907.

J. B. BLAW'. MOLD AND CENTERING DEVICE FOR SEWERS, OONDUITS, &o.

APPLICATION TILED JAN. 20, 1906.

2 SHEETS-SHEET 2.

witness @y z'oh u 1' the upper ends ofthe section B, and have on line yy 5,.

PATEN T OFFICE.

JACOB B. BLAW, or PITTSBURG, PENNSYLVANIA, ASSIGNOR TO BLAW COLLAPSIBLE STEEL CENTERING COMPANY, OF PITTSBURG, PENNSYIr.

VANIA, A CORPORATION OF NEW JERSEY.

- MOLD AND CENTERl NG DEVICE FOR SEWERS, CONDUITS, 8e0- Specification of Letters Ifatent.

Patented. April 23, 1907.

Application filed January 20, 1906- SerialNp. 296,939.

To all whom it may can earn.-

Be it known that I, JACOB B. BLAW, a citi- 'zen of the United State residing at Pittsburg, in the county of Allegheny, State of Pennsylvania, have invented a new and useful Mold and Centering Device for Sewers, Conduits, &c., of which the following is a specification.

My invention consists of a device for moldmg and centering sewers, conduits, manholes,

stacks, pipes and the like that may beformed of concrete, cement or other plastic material, the construction of the same being hereinafter described and the novel features pointed out in theclaims.

Figure 1 re resents a dian'ietrical section of a mold an centering device embodying my invention.

Figure 2 represents a longitudinal section thereof on line a :ac Figure 1.

Figure 3 represents a section of a portion.

on line zz Flgure 2 on an enlarged scale.

Figure 4 relapresents a section of a portion igure 3. Figure 5 represents an end view of another portion of the device embodying my invention.

Figure firepresents a longitudinal section thereof. I Similar letters of reference indicate corresponding parts in the figures.

Referring to the drawings: A and B designate the upper and lower interior sections of a mold or centering device,

. D there are connected the screw-threaded and C designates an upper exterior section thereofl Connected with the interior of the up or section are brackets D and connected w1tl1 the interior of the lower section are brackets E, said brackets being preferably of angular form.

To the upper limbs or ends of the brackets rods F, with Whose inner ends engages the threaded buckle G.

To the upper limbs orends of the brackets E are connected the screw-threaded rods'H, with whose inner ends engages the threaded buckle J i The lower ends of the, brackets D overlap to receive the wedges, J which are adapted to ride upon the adjacent portions of the brackets D and thus firmly connect the sections A and B as one, it being noticed that said sections are formed of strong but sufficiently liable metal that their ends may be drawn inwardly for purposes to be hereinafter explained.

The exterior section is divided at top where the inner ends of the divisions haveibrackets M secured thereto and rising therefrom, the same receiving the bolts N on which are nuts P whereby said divisionsmay be connected as one and provision is made for lateral adjustment of the divisions.

On the side portions of the divisions are shoulders Q against which may be seated the braces R which also engage the walls of the trench inwhich the sewer, conduit, etc. is formed. I

The operation is as follows:

After the trench is formed, a mass of concrete, cement or other plastic material is placed on the bottom and sides of the same to form say the lower half of a'sewer, conduit,etc. the extent of the material being in accordance with the thickness of the sewer, conduit, etc. to be formed.

' The lower section B is now placed in the trench and rested upon said mass. The upper section A-is then fitted on said lower section B and coupled therewith by means ,of the stirrups or butt straps K, the end portions ofsaid upperlsection ,havingbeen' drawn in or contracted by operating the buckleG so that they will pass over said stirrups, after which said end portions are expanded so. that the brackets D bear against the lower section B, when the wedges L; are introduced into the stirrupsand forcedinto the same, thus connecting said brackets with lower sections and firmly uniting the two'sections as one, as a complete inner mold, and the upper and lower sections may be coupled-together at one peration and the material deposited in a monolithic form if so desired.

' inexpensive mold.

Another mass of the material is now placed on the upper portion of said mold as a continuity of the lower portion, thus forming the contour of a sewer, conduit, etc., endless in circumferential direction.

The upper exterior section C is duly set up and material admitted at the top to the required thickness of the conduit, etc. For the operation of said section C, I employ chains S which are passed around the rods N and the plank T which is placed across the trench, thus providing convenient means of directing said section (J into position.

The braces R are also located and forced downwardly, whereby as they press against the shoulders Q, the section'C causes a compression of the mass of material from above and imparts the desired shape to the exterior of the sewer, conduit, etc.

The biickles' G, J, are now operated so as to compress the mass from within, thus molding and centering the interior of the mass which, when set, produces a properly-shaped, uniform,-strong and durable and comparatively The upper section C may then be released, raised and thereby removed at the top of the trench and the sections A, maybe contracted and disconnected and each section withdrawn at the open end of the sewer, conduit, etc.

The upper end of the trench may be filledin, thus covering the top of the sewer, conduit, etc. I I 1 In order to provide a strong connection for the rods F and H with the respective brackets D, E, said rods have their ends bifur' cated as at U and have passed through them the bolts V which bolts, whcntightened by suitable nuts, firmly connect "the rods and brackets, the efiect of which is evident.

It is evident that the upper and lower sections A, B, n1ay be coupled and lowered in position when the material may be introduced and passed entirely around the eX-. terior of said sections in the trench and so produce at one operation a monolith conduit, etc., the same being homogeneous and seamless. 1 I

Inorder to reinforce the sections of the mold, I employ the braces W which are of the form of V-shaped oracute angle bars of braces WV, thus additionally strengthening 5 suitable metal, the same being riveted or otherwise rigidly secured to the interior of the sections in the longitudinal. direction thereof, thus stiffening and strengthening the same. v

At the ends of the sections and between the ends, there are L-shaped braces X, thesame being riveted or otherwise rigidly secured to the interior of the sections and ex tending in the circular or transverse direction of the sections or at a right angle to the the mold.

,see

preferably of wood, the same being bolted, or

otherwise firmly secured to said limbs.

After the sections have been expanded, said wedges are driven in between said limbs, after which the bolts, or other fastenings are applied, it being seen that said wedges form an abutment for said limbs and prevent closing of the sections at the joint,*while with the assistance of the braces W, they strengthen the joints of the sections which in the present case are at the top and bottom thereof.

- Havingthus described my invention, what. I claim as new and desire to secure by Letters Patent, is.

1. In combination, a tubular mold comprising parti-tubular sections of flexible material, angle irons secured to the opposing edges of one section with one leg of each overlapping edge otthe other section, rigid ad-' ustmg means extending transversely ofthe mold' and secured to the free legs of the op posing angles whereby the edges may be sprurigin and (put,- andmeans whereby the edges offtheother section may be sprung in andout. 2. In combination, a tubularmold -comprising parti tubular sections of flexible material, flanged stiflening sections secured to the opposin edgesof one section with one. ieg of each over apping the edge of the other section, rigid adjustln means extending trans versely of the mol and secured to the free flanges of the opposing sections whereby the edges may he s rung in and out, and means whereby the, e ges 'of the other section may be sprung inand out.

3. In combination, a tubularmold comprising parti'tubula'r sections of flexible material, angleirons secnred'to the opposing edges of onesection with one legrof each overlapping the edges of theother section, and rigid adjusting means extending transversely of the mold and secured to the free legs of the opposing angles whereby the edges may be sprung in and out.

4. In combination, an exterior mold member comprising opposing partitubular sections spaced apart at the top, and bolts connecting the two parts whereby they-are drical mold member comprising opposing 5. In combination, an exterior semi-cylinparti-tubular sections spaced apart at the top, and adjustable means connecting the two parts whereby they are held in their relative positions and a s ace for the introductionof material is provi ed. p

6. In combination, an exterior mold section comprising a parti-tubular member, projecting blocks Q for steadying, the ends of side braces, and means whereby the mold section may be supported.

7. In combination, parti-tubular sections, acute securing angles at the opposing/edges thereof, a stiffening wedge fitting therebetween and means for securing the Wedge rigidly to the angles.

8. In combination, opposing parti-tubular members of flexible material, stiffening i flanged members extending circumferentially of the sections, and transverse adjustable means for engaging the flanged me'mbers ad jacent the edges of the parti-tubular mem' ber. 9. In combination, opposing pzirti-tubular members of flexible material, stiflening sections having projecting legs extending circumferentially of the sections and provided with a plurality of engaging holes spaced therealong; and transverse securing struts adapted to engage removably the holes in opposing sections.

' JACOB B. BLAW'.

\Vitnesses:

ED. J. DICKSON,

PROSPEBI CARLO. 

